1 Nmi = 1.85 km. You can use 1 Nm = 2 km, with a 7% known error. Just multiply/divide by 2 in your head. A 7% error is not good enough for a fire control solution. But it's certainly good enough for approach and engagement planning. Once you reach engagement range, you can refine your fire control solution with visual/hydrophone data. No need to modify existing tools. It's the kind of shortcut RL kaleuns used.
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